I'm a bit confused by this thread, somehow I have the impression I missed something (that's why I left TOFU in this mail).
Anyway, I'd like to summarize: There are many-many objects (most of them buildings - 96%) tagged with start_date=* - I think, that's great. start_date is quite well documented and very flexible concerning ranges and approximations. My suggestion was to use a prefix "building:" if the start_date of the building differs from the start_date of the amenity. It is not very common though right now, with only 163 uses. Only 9 have both start_date and building:start_date. When investigating this issue - triggered by this thread, I/we discovered that there are alternative building age tagging schemes. I made a search through taginfo and found some more tags: * "building:age" - very popular (132071), but rather useless. 41% have the value "post_2000", 19% "pre_2000". 12.9% "10_to_30" (should this mean " 10 to 30 years? - this is wrong on so many levels, I don't even know where to start). It's documented on the start_date page as possible tagging mistake. https://taginfo.openstreetmap.org/keys/building%3Aage#values * "building:year_built" - some (3005). Mostly start year or in some cases approximations (but different syntax from start_date). I found no documentation at all. https://taginfo.openstreetmap.org/keys/building%3Ayear_built#values * "building:buildyear" - some (2051). Only very few objects use approxiations. As mentioned by Sergio, it was introduced in the IndoorOSM proposal. https://taginfo.openstreetmap.org/keys/building%3Abuildyear#values * "year_built" - some (2417, whereas many might not be buildings). No documentation. https://taginfo.openstreetmap.org/keys/year_built#values * "building:year" - few (102). It's documented on the start_date page as possible tagging mistake. https://taginfo.openstreetmap.org/keys/building:year#values It seems, that 'start_date' is be the preferred way to tag the age of a building. Tag is popular and well documented. I took the liberty of adding it to the additional attribute section on https://wiki.openstreetmap.org/wiki/Key:building What I wanted, was to introduce a way to highlight different start_dates for the same object (e.g. old building, new use). I personally would prefer 'building:start_date' as fallback, as it uses the same syntax as start_date. And it could be applied to other keys as well (and this is being used). Do you think, that any of the other tags should be supported as well? Anyway, I will modify the OpenStreetBrowser category to also supprt "building:year_built", "building:buildyear", "yearbuilt" and "building:year" (but with the syntax of the start_date tag). "building:age" will be shown red (date format not supported). I'm planning to introduce some quality assurance tools in OpenStreetBrowser in the near future. I would show these alternative tagging schemes as warnings. greetings, Stephan On Sat, Feb 16, 2019 at 04:08:03PM +0000, St Niklaas wrote: > Hi Stephan & all, > > I realised this see the lines below, > > Sergio Manzi <s...@smz.it> > Za 16-2-2019 16:06 > > Hello! > > > Actually the analysis was not mine, but just the result of a query in taginfo > (https://taginfo.openstreetmap.org/keys/?key=building%3Astart_date), but I > guess I understand what's going on here: > > > all of the objects you're referring are tagged with a start_date=* key, while > the tag I was referring to (and was discussed in the mailing list) is > building:start_date=* (note the presence of the "building:" namespace > prefix...). > > > A query for "your" key > (https://taginfo.openstreetmap.org/keys/?key=start_date) returns 14246906 > objects!! > > > I don't know how many of those more than 14 millions objects are buildings, > but I suspect quite a good number (an appropriate query in overpass turbo can > clarify that, I guess). > > > Normally I'm all in for supporting namespaces, but I understand that we have > a problem here and it would be just silly to throw away such a bunch of good > information. > > > I suggest you to answer to the mailing list too and underline this situation. > You can quote my answer in full or in part, if you wish. > > > Regards and my compliments for your outstanding contribution, > > > Sergio > > > > > On 2019-02-16 15:42, St Niklaas wrote: > > Hi Sergio, > > > I doubt your analyses, since almost all buildings (5 million) in the > Netherlands that have been imported since 2014, carry "start_date = 2022" or > alike. Have a look here https://www.openstreetmap.org/#map=19/52.53890/4.83687 > > The import comes straight out of the Dutch Cadastre after a lot of hard work > getting the go ahead from the government. But my contributions are not among > them, the BAG (Basis Addresses and Buildings) don’t measure covered buildings > even if they are historic monuments, so that’s my speciality and they import > my OSM work into the BAG 🙂 > > > Greetz > > > [https://www.openstreetmap.org/assets/osm_logo_256-cde84d7490f0863c7a0b0d0a420834ebd467c1214318167d0f9a39f25a44d6bd.png]<https://www.openstreetmap.org/#map=19/52.53890/4.83687> > > OpenStreetMap<https://www.openstreetmap.org/#map=19/52.53890/4.83687> > OpenStreetMap is the free wiki world map. OpenStreetMap is a map of the > world, created by people like you and free to use under an open license. > www.openstreetmap.org<http://www.openstreetmap.org> > > > > ________________________________ > -- Seid unbequem, seid Sand, nicht Öl im Getriebe der Welt! - Günther Eich ,----------------------------------------------------------------------. | Stephan Bösch-Plepelits ❤ code ❤ urbanism ❤ free software ❤ cycling | | Projects: | | > OpenStreetMap: openstreetbrowser.org > openstreetmap.at | | > Urbanism: Radlobby Wien | | Contact: | | > Mail: sk...@xover.mud.at > Blog: plepe.at > Code: github.com/plepe | | > Twitter: twitter.com/plepe > Jabber: sk...@jabber.at | | > Mastodon: @pl...@en.osm.town | `----------------------------------------------------------------------'
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